PROFIBUS brochure - Indu-Sol GmbH

PROFIBUS infrastructure components
networks
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What is a repeater and what is it used for?
Repeater product range MULTIrep (X2, X5, X7)
MULTIrep ® X2, X5, X7
A repeater is an electronic component that receives incoming
signals and forwards – repeats – them refreshed (see fig. 19).
Because this process uses optocouplers in the repeater, two
galvanically separate segments are created.
Repeaters are used to ensure trouble-free operation of a
PROFIBUS network and fulfil the relevant standards. Per seg-
RECOMMENDATION − Cable length
In PROFIBUS networks, the maximum transmission
distance for the transmission speed has to be observed.
Transmission speed in kbps Transmission distance in m
9,6 1200
19,2 1200
45,45 1200
93,75 1200
187,5 1000
500 400
1500 200
3000 100
6000 100
12000 100
incoming bad signal
ment, a maximum of 32 devices can be used (including the
repeater). The maximum line length is always considered per
segment.
For creating a network with 32 devices or a very large networks,
then the use of repeaters is necessary. They are also
suitable for isolating anomalous devices or devices that are
susceptible to faults.
Fig. 18: Linear structure application example
outgoing refreshed signal
Star networks and telegram traffic
With the MULTIrep range of repeaters, the PROFIBUS network
can be subdivided into two, five or seven galvanically
independent segments. The star structure with multiple small
segments and refreshed signals has many benefits in regard
to stable operation and troubleshooting.
Bus:
Data:
Bus health by channel
Green: Okay
Red: Error telegram, repetition,
diagnostic messages, device failures
Green: Bus activity on the channel
Red: Configuration problem on the PB
Off: No bus activity present
The MULTIrep repeater continuously monitors the PROFIBUS
telegram traffic and signals any detected logical or physical
anomalies. The bus LED signals error telegrams and repetitions.
The data LED shows whether a slave is communicating
on the channel and whether it is configured without errors.
Highlights
■■
Enables stubs in PROFIBUS
■■
Isolates sensitive or problematic areas
■■
Expansions or shutdowns possible during running operation
■■
Errors affect only small parts of the network
MULTIrep X2
The use of repeaters enables the expansion of a PROFIBUS
network to include a maximum of 126 devices, as well as
longer cables for the same transmission speed. Per segment,
a maximum of 32 devices are permitted. The MULTIrep X2
repeater regenerates the voltage
signal in both directions and amplifies
it to the standard PROFIBUS
level. The content of the signal
remains unchanged. From a physical
point of view, the use of this repeaters
creates two galvanically separated
segments.
72 mm
MULTIrep X5 und X7
With the multiple repeaters X5 and X7, the MULTIrep range
is the ideal basis for a robust PROFIBUS star network. The
MULTIrep stands out by its simplicity and reduction to the
essentials. The PROFIBUS wiring is implemented with proven,
reliable SUB-D connectors. There are no error-prone DIP switches
or terminal points on the device. The integrated diagnostic
function is a
highlight of the
MULTIrep series.
The telegram traffic
is continuously
monitored, and the
health of each segment
is indicated
with LEDs.
142 mm
MULTIrep X2 − 105 mm
MULTIrep X5 − 105 mm
outgoing refreshed signal
incoming bad signal
Fig. 19: Signal refreshed by a repeater
RECOMMENDATION − star-shaped structure
The use of repeaters (INBLOX ® or MULTIrep) enables the the formation of groups by location, function or technology
– the linear structure (see fig. 18) is dissolved. Small
implementation of a key benefit of Ethernet-based networks
into PROFIBUS: The star-shaped structure (see fig. 20). segments make the network structure easy to understand
Every thread going out from a repeater is a galvanically and simplify diagnostics.
independent segment with a refreshed signal. This permits
Fig. 20: Star network application example
MULTIrep X7 − 105 mm
212 mm
22 23